Haunter of the Dark is my all time favorite Lovecraft story.

I grew up on one hill overlooking a valley and spent countless nights watching car lights and house lights on the other hill across the valley wondering what they were and where they were going.

Reading Haunter in the Dark made my hair stand up on end almost the whole way through. Turned fond childhood memories into nightmares (not really, but kind of).

It's fantastically well written and down right creepy.